ajax servlet端小问题

说是小问题。。。调试了一天气死了

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        response.setContentType( "text/html;utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter writer = response.getWriter();
        
        if(null != username && null != password) {
            if(username.equals("") || password.equals("")) {
                writer.println("don't post empty value");
            } else {
                
                if(username.equalsIgnoreCase("xc") && password.equalsIgnoreCase("123")) {
                    writer.println("ok");
                } else {
                    writer.println("error");
                }                
            }
            response.flushBuffer();
        }
    }

很简单的提交，返回

ok后面直接多了个%0D%0A，

今天才知道，println啊…………………………

全部改成print就对了。。。